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The SKH 63-4B2 is an electrical contactor made by Besel that is used in a range of applications such as motor control, switching circuits, and controlling electrical loads. It is a 3-pole DC contactor, with an AC-3 rated current of 63A at 440V, and a DC-1 rated current of 4A at 440V. The contactor is designed for use in harsh environments and has a rated operational life of 100,000 operations, and an IP67 level of protection from dust and water ingress. It also features an adjustable switching time from 0.1 to 10 seconds, and an adjustable voltage drop from 40 to 240V.